Comment 1 for bug 1962799

For NMI watchdog, I found some explanation from google.

What could happen if I disable nmi_watchdog permanently?
Imagine your system locks up. There's 2 possibilities now:
1) You have a hardware NMI button (some servers do). Push it, then the kernel (if properly configured) dumps a trace to console and reboots.
2) Your kernel reaches a halting state that can't be interrupted by any other method. In this case, the watchdog can reboot the machine.